An aquatic plant was placed in a test tube containing water. The tube was then stopered and left outdoors for 24 hours. The pH value of water was measured at regular intervals. What must have been the result?

What happens when you blow air into a test tube containing lime water?

Two healthy green plants were placed in the dark for 24 hours. They were then set-up as shown in the figure and left for 4 hours. Then a leaf was taken from each plant and the chlorophyll was removed from the leaves What hypothesis is being tested in this experiment?

Two healthy green plants were placed in the dark for 24 hours. They were then set-up as shown in the figure and left for 4 hours. Then a leaf was taken from each plant and the chlorophyll was removed from the leaves What would be the result of the final step?

The diagram given below is a set up to demonstrate an experiment Pond-weed was placed in five water-filled tubes. The experiment was set-up as shown in the diagram. The tubes were then left for 24 hours The tube in which the plant would survive for the shortest length of time is

To check the pH of tap water and compare it with pH of the water in the local water body. Apparatus : Test tubes or beaker Materials : Universal pH indicator / litmus paper Procedure : implies Take water sample from tap of your home in a test tube. implies Add few drops of the universal indicator into the test tube containing tap water. implies Observe the water sample in the test tube for colour change. implies Test pH using a litmus paper, in the water sample placed in a beaker. implies Dip the litmus paper into the water in the local water body. implies Observe colour changes of the litmus paper. Observation : implies Test tube containing tap water, turns yellow colour with addition of pH indicator. implies Litmus paper does not show colour change with tap water. implies Water sample collected from pond shows red colour with pH indicator. Litmus paper turns red as it is dipped in water of local water body. Conclusion : The uncontaminated tap water is neutral while water of local water body is acidic. Can aquatic life survive in acidic water of water body?

The diagram given below is a set up to demonstrate an experiment Pond-weed was placed in five water-filled tubes. The experiment was set-up as shown in the diagram. The tubes were then left for 24 hours In which tube would you expect to find the plant with the least amount of starch?

To check the pH of tap water and compare it with pH of the water in the local water body. Apparatus : Test tubes or beaker Materials : Universal pH indicator / litmus paper Procedure : implies Take water sample from tap of your home in a test tube. implies Add few drops of the universal indicator into the test tube containing tap water. implies Observe the water sample in the test tube for colour change. implies Test pH using a litmus paper, in the water sample placed in a beaker. implies Dip the litmus paper into the water in the local water body. implies Observe colour changes of the litmus paper. Observation : implies Test tube containing tap water, turns yellow colour with addition of pH indicator. implies Litmus paper does not show colour change with tap water. implies Water sample collected from pond shows red colour with pH indicator. Litmus paper turns red as it is dipped in water of local water body. Conclusion : The uncontaminated tap water is neutral while water of local water body is acidic. What is the cause for acidic water in water body?

To check the pH of tap water and compare it with pH of the water in the local water body. Apparatus : Test tubes or beaker Materials : Universal pH indicator / litmus paper Procedure : implies Take water sample from tap of your home in a test tube. implies Add few drops of the universal indicator into the test tube containing tap water. implies Observe the water sample in the test tube for colour change. implies Test pH using a litmus paper, in the water sample placed in a beaker. implies Dip the litmus paper into the water in the local water body. implies Observe colour changes of the litmus paper. Observation : implies Test tube containing tap water, turns yellow colour with addition of pH indicator. implies Litmus paper does not show colour change with tap water. implies Water sample collected from pond shows red colour with pH indicator. Litmus paper turns red as it is dipped in water of local water body. Conclusion : The uncontaminated tap water is neutral while water of local water body is acidic. Can you say whether the water is polluted or not on the basis of your observations?

Four test tubes were taken and marked A, B, C and D respectively. 2 mL of solution of Al_(2)(SO)_(3) in water was filled in each of the four test-tubes. Clean piece of metal zinc was placed in test tube A, clean iron nail was put in test tube B, clean copper wire was placed in test tube C and a clean aluminium wire was placed in test tube D. What colour change would you observe in all the four tubes ?

A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours. During the starch test, why was the leaf: (1) boiled in water (2) boiled in methylated spirit